MySQL select to count values equal to 0 and greater than 0 from a column?

For this, use the CASE statement. Let us first create a table −

mysql> create table DemoTable    (    Number int    ); Query OK, 0 rows affected (0.83 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(0); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(50); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(0); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(0); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.15 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

Output

+--------+ | Number | +--------+ | 10     | | 0      | | 20     | | 50     | | 0      | | 0      | | 40     | +--------+ 7 rows in set (0.00 sec)

Let us now see how to select count values equal to 0 and greater than 0 from a column

mysql> select sum(case when Number > 0 then 1 else 0 end ) AS TotalValueWhichIsGreaterThanZero,    sum(case when Number = 0 then 1 else 0 end) AS TotalValueWhichIsEqualToZero    from DemoTable where Number >=0;

Output

+----------------------------------+------------------------------+ | TotalValueWhichIsGreaterThanZero | TotalValueWhichIsEqualToZero | +----------------------------------+------------------------------+ | 4                                | 3                           | +----------------------------------+------------------------------+ 1 row in set (0.00 sec)